Get the ref clock of the PHY from the device tree instead of hardcoding its name and rate.
Signed-off-by: Matthias Kaehlcke mka@chromium.org Reviewed-by: Stephen Boyd swboyd@chromium.org --- Changes in v5: - added "Reviewed-by: Stephen Boyd swboyd@chromium.org" tag
Changes in v4: - always use parent rate in dsi_pll_28nm_clk_set_rate() - pass name of VCO ref clock to pll_28nm_register() instead of storing it in a struct field - updated commit message
Changes in v3: - use default name and rate if the ref clock is not specified in the DT - store vco_ref_clk_name instead of vco_ref_clk - fixed check for EPROBE_DEFER - renamed VCO_REF_CLK_RATE to VCO_REF_CLK_DEFAULT_RATE
Changes in v2: - patch added to the series --- .../gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c | 24 +++++++++++++++---- 1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c index 49008451085b8..76e5188169b91 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm_8960.c @@ -47,7 +47,6 @@
#define NUM_PROVIDED_CLKS 2
-#define VCO_REF_CLK_RATE 27000000 #define VCO_MIN_RATE 600000000 #define VCO_MAX_RATE 1200000000
@@ -125,7 +124,7 @@ static int dsi_pll_28nm_clk_set_rate(struct clk_hw *hw, unsigned long rate, DBG("rate=%lu, parent's=%lu", rate, parent_rate);
temp = rate / 10; - val = VCO_REF_CLK_RATE / 10; + val = parent_rate / 10; fb_divider = (temp * VCO_PREF_DIV_RATIO) / val; fb_divider = fb_divider / 2 - 1; pll_write(base + REG_DSI_28nm_8960_PHY_PLL_CTRL_1, @@ -406,11 +405,12 @@ static void dsi_pll_28nm_destroy(struct msm_dsi_pll *pll) pll_28nm->clks, pll_28nm->num_clks); }
-static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm) +static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, + const char *ref_clk_name) { char *clk_name, *parent_name, *vco_name; struct clk_init_data vco_init = { - .parent_names = (const char *[]){ "pxo" }, + .parent_names = &ref_clk_name, .num_parents = 1, .flags = CLK_IGNORE_UNUSED, .ops = &clk_ops_dsi_pll_28nm_vco, @@ -494,6 +494,8 @@ struct msm_dsi_pll *msm_dsi_pll_28nm_8960_init(struct platform_device *pdev, { struct dsi_pll_28nm *pll_28nm; struct msm_dsi_pll *pll; + struct clk *vco_ref_clk; + const char *vco_ref_clk_name; int ret;
if (!pdev) @@ -506,6 +508,18 @@ struct msm_dsi_pll *msm_dsi_pll_28nm_8960_init(struct platform_device *pdev, pll_28nm->pdev = pdev; pll_28nm->id = id + 1;
+ vco_ref_clk = devm_clk_get(&pdev->dev, "ref"); + if (!IS_ERR(vco_ref_clk)) { + vco_ref_clk_name = __clk_get_name(vco_ref_clk); + } else { + ret = PTR_ERR(vco_ref_clk); + if (ret == -EPROBE_DEFER) + return ERR_PTR(ret); + + dev_warn(&pdev->dev, "'ref' clock is not specified, using default name\n"); + vco_ref_clk_name = "pxo"; + } + pll_28nm->mmio = msm_ioremap(pdev, "dsi_pll", "DSI_PLL"); if (IS_ERR_OR_NULL(pll_28nm->mmio)) { dev_err(&pdev->dev, "%s: failed to map pll base\n", __func__); @@ -524,7 +538,7 @@ struct msm_dsi_pll *msm_dsi_pll_28nm_8960_init(struct platform_device *pdev, pll->en_seq_cnt = 1; pll->enable_seqs[0] = dsi_pll_28nm_enable_seq;
- ret = pll_28nm_register(pll_28nm); + ret = pll_28nm_register(pll_28nm, vco_ref_clk_name); if (ret) { dev_err(&pdev->dev, "failed to register PLL: %d\n", ret); return ERR_PTR(ret);